Dynamo-electric machine.



W. A. DICK.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED DEO.31,1908.

Patented NOV. 28, 1911.

2 SHEBTS-SHEET 1.

ATTORN EY miyw W. A. DICK.

DYNAMO ELECTRIC MACHINE.

APPLICATION PILEDYDEO. 31, 1908.

Patented Nov. 28, 1911.

2 SHEETSSHEET 2.

WITNESSES:

UNITED STATES (PATENT. OFFICE.

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nImAno-amcirmc MACHINE... I

- Patented Nov. 28, 1911.

Application filed December a1, 1905. Serial 1'... 470305.

To all whom it may concern:

Be it known that I, WILLIAM A. DICK, a citizen of the United States,and' a resident of Pittsbur h, in the count of Allegheny and State Pennsylvania, ave invented a new and useful Im rovement in Dynamo- Electric Machines, 0 which the following is a specification.

My invention relates to d namo-electric machines, and it has for its ob ect to provide a field coil structure of such character that a machine of a given ratin may be more economically constructed an operated. than has heretofore been possible.

The normal capaclty or rating of a dynamo-electric machine is partially determined by the maximum temperature rise of its stas tionary parts, in operation. In direct current machines having rotating armaturesv and stationary field ma ets, the field magnet windings are most li ely to become overheated in operation, and this is particularl true of machines which are provided with intermediate poles for the purpose of improving the commutation, since the coils on 'the'intermediate polo pieces are close to the coils on the main pole pieces.

According to in .present invention, I rovide sim le and e cient coil structuresw ich are capa 1e of eneral application but are primarily intended for machines which are cooled by forced ventilation.

Figure 1 of the accompanying drawing is an end elevation, partially in secti0n,.of a portion of the stationary field magnet frame and windings of a dynamo-electric machine embodying my invention. Fig. 2 is a bottom plan view ofone of the coils shown in- Figl, the auxiliary pole piece being shown in section, and Fi 3 is a view similar to' Fig. lbut illustrating a modification of my invention.

Referring to Figs. 1 and 2 of the drawing, the structure here illustrated comprises a stationarly frame 1. having a plurality of main po ar' projections 2 and intermediate polar projections 3, auxiliary coils 4 on the intermediate-polar projections 3, and series coils 5 and shunt coils 6 on the main polar I projections 2. Each of the auxiliary coils 4 insulating washers 8, the turns being held 65 intermediate polar projections 3, near the body of the frame 1, b means of bolts 13. The outer ends of the olts 9 are provided with spools or bushings 14 of insulating material which are located in the slots in'the projections 12. In assembling the auxiliary coils 4, the insulatin spools or bushings 14 are first placed in t e slots in the projections 12. The coils 4, with the bolts 9 in position, are then placed upon the auxiliary projections 3, with the ends of the bolts projecting through the spools 14. The coil is finally clamped rigidly in position by means of nuts '15. The polar projection-itself is provided with a wrapping 16 of insulating (I material and the convolutions of the co which are near the ends of the projections are wound with tape, or otherwise insulated, the intermediate convolutions being left uncovered to facilitate the radiation of heat from their surfaces. similar, in construction to the auxiliary coil 4 and comprises several convolutions 17, of bare copper strap or other suitable conductor, which are bound together by clamping bolts 18, being-first spaced apart by insulating washers 19. The ends of the, bolts 18 are counter-sunk into insulating blocks 20 which serve to space the coil from the shunt coil 6 on one side and from the bod of the frame 1 on the other. The shunt coi 6 comprises a plurality of layers or bundles 21,22, 23, 24, 25 and 26, which varyin'cross-sectiona form according totheir positions on the main polar pro ection 2 and each .''of.

which is com osed of a large number of convolutions 2 of conducting wire or strap. Since the side faces of each polar projection are parallel to each other, and since the projections extend radially inward from the oylindrical frame structure 1, the adjacent sides of adjacent projections obviously converge toward the center so that theirinner ends are relatively close together. bundles or layers of which the shunt coil windin in width to avo1d interference with the auxiliary winding 4. Each'of the layers of the coil 6 is virtually a separate winding, and

The series coil 5 is 80 The is composed are accordingly varied 10b relatively is provided withan independent insulatin wrapping 28. The several layers are space apart by strips or blocks 29 and their relative ositions are maintained b bands 30, whic are relatively narrow an only cover small ercentage of the surface of the coil. The 00' 5 and 6, which are located on the main olar projections, are held in placeby pole tips 31', the polar projections themselves being detachably secured to the frame 1.

The above described field magnet coils are simple to manufacture and are held rigldly in position without interfering with ventilation, a mam'mum radiating surface being exposed to the atmosphere.

Reference may now be had to Fig.3 in which corresponding parts are designated by the same reference characters. In lieu of the main pole pieces 2 of Fig. 1, which are provided with parallel side faces, main pole pieces 28 are substituted, the sides of which, adjacent to the intermediate pole pieces 3, are substantially radial. By this means, the magnetic leakage in the core member is reduced, and the space for the series and shunt coils 29 and 30, is materially increased.

Each'of the pole pieces 28 is provided with a tip 31 the face dimensions of which are substantially the same as those of the tip 31 shown in Fig. 1. The coil 30 is com osed of a plurality of layers which are 0 dif ferent internal dimensions in order that the coil may fit the p'olepiece. The coil 29" comprises a plurality of convolutions which are spaced apart at intervals byblocks 32 of insulating material, the convolutions being wrapped with taip'e or other suitable means being provided 0 pole and its coil are similar to those shown placed by a structure similar to the coil 5 of Fig. l,provided there is sufficient space between the shunt coil and the frame of the machine to permit of the use of spacing blocks 20.

It will, of course, be understood that structural modifications may be effected without departing from the spirit of my invention, and I desire that only such modifications shall be imposed as are indicated in the ap-' pended claims.

I claim as my invention;

1. A field magnet coil for dynamo-electric machines comprising bundles or layers of different widths each composed of a plurality of convolutions of a conductor bound together by a wrapping of insulating material, spacing blocks between the layers and relatively narrow bands for securing the layers together.

2. A field magnet winding for dynamoelectric machines comprising a series coil having a plurality of turns of strap conductor spaced apart by insulating washers r maintaining the proper relation between them. The intermediate and clamped together by insulated bolts and I I a shunt coil comprising a luralit of sec: tions separated by spacing locks or ventilation.

3. A field magnet winding for dynamoelectric machines comprising a series coil having a plurality of turns of strap conductor spaced apart by insulating washers andclamped together by insulatin bolts and ashunt coil comprising bun les or layers severallycomposed of apluralit-y of convolutions of a conductor and means for spacing the bundles or layersapart.

4. A field magnet winding for dynamo-,

electric machines, comprising a series coil composed of a plurality of turns of strap conductor spacedapart by insulating washers and clamped together by insulated bolts and a shunt coil comprising bundles or layers severally composed of a plurality of convolutions of a conductor, spacing blocks ofinsulatin material between the layers, and insulatmg bands for fastening the layers together.

5. In a dynamo-electric machine the combination with main and intermediatepolar projections, of series coils and shunt coils for the main projections, said shunt COIlS severally comprising bundles or layers each of which is composed of a pluralit of convolutions of a conductor, spacing locks of insulating material between the layers and insulating bands for fastening the layers together, the side faces of the main projections being substantially radial and the bundles or layers of the shunt coils being offset to conform to the shape of the polar projections.

6. A dynamo-electric machine comprising a field magnet frame having a polar projection, coil-supporting means secured to the base of the projection, a coil mounted on the rojection, and means for detachably clampmg said coil directly to said supporting means.

7 A dynamo-electric machine comprising a field magnet frame having a polar projection, coil-supporting bars secured to the base of the projection and a coil, having spaced turns, mounted on the projection and secured tothe bars.

8. A dynamo-electric machine comprising a field magnet frame having a'polar proj ection and wrapping of insulation therefor,- coil-supporting means secured to the base of the projection and a coil mounted on the projection, said coil comprising a plurality 'electric machines "comprising a series coil and shunt coil and an auxillary or commutating field coil, said series and commutatin field coils compr sing a plurality of turns 0 10 was stra conductor spaced apart b insulating was ers and clamped together y insulated bolts.

10. A field magnet winding for dynamoelectric machines comprising a serles coil and shunt coil and an auxiliary or commutat-ing field coil, said series and commutating field coils comprising a plurality of turns of insulating strag conductor spaced apart by ers and clamped together y insulated bolts and said shunt coil comprising a plurality of sections separated by spacing subscribed my name this 21st day of De- 1 cember, 1908.

WILLIAM A. DICK. Witnesses:

M. V. BLAKEMoRE, BIRNEY HINES. 

